The Lowrance Hybrid Dual Imaging (HDI) Skimmer Transducer uses a Broadband Sounder (83/200 kHz) plus DownScan Imaging (455/800 kHz). The Sounder operates at depths up to 1,000 feet. The DSI signal features a maximum depth capability of 350 feet. The unit is compatible with Broadband Sounder sonar of HDS. Removable mounting neck. Includes a stainless steel ratchet system for transom mount. Compatible with Lowrance Scupper Mount and Lowrance HDI Trolling Motor Adapter.